11-01-2012
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Join Date: Mar 2004
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It sounds like you're intentionally keeping the system at RHEL 5.3 via the yum config (is that correct)? There are really only two options:
1) Temporarily remove the lock, and run a "yum update perl" to get to the latest version (5.8.8). Pay attention to the list of software it wants to install for dependencies and make sure it doesn't try to pull a newer version of glibc or the kernel down which is going to bump you passed RHEL 5.3. If it doesn't (and I don't imagine it would) then you can do the update and just reconfigure yum to lock yourself into RHEL 5.3 again.
2) Manually download the RPMs from Red Hat's Customer Portal and force the installation with --nodeps. This is by far the most dangerous option since you run the risk of killing off your entire perl install.
For what you're wanting those are the two options. What end are you hoping to meet by having that specific version installed though? We might be able to think of a way to reach that end without doing an update to a fundamental part of the system.